1222978998528 has 864 divisors, whose sum is σ = 4621546137600. Its totient is φ = 316600897536.

The previous prime is 1222978998523. The next prime is 1222978998629. The reversal of 1222978998528 is 8258998792221.

1222978998528 is a `hidden beast` number, since 1 + 2 + 2 + 2 + 9 + 7 + 8 + 9 + 98 + 528 = 666.

It is a tau number, because it is divible by the number of its divisors (864).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (1222978998523) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 148002525 + ... + 148010787.

Almost surely, 2^{1222978998528} is an apocalyptic number.

1222978998528 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1222978998528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2310773068800).

1222978998528 is an abundant number, since it is smaller than the sum of its proper divisors (3398567139072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1222978998528 is a wasteful number, since it uses less digits than its factorization.

1222978998528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8344 (or 8317 counting only the distinct ones).

The product of its digits is 209018880, while the sum is 72.

The spelling of 1222978998528 in words is "one trillion, two hundred twenty-two billion, nine hundred seventy-eight million, nine hundred ninety-eight thousand, five hundred twenty-eight".